Heroin Program's Deadly Toll

Needle Exchanges Save Lives but May Imperil Workers

By

Justin Scheck

Updated Jan. 10, 2009 11:59 p.m. ET

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SAN FRANCISCO -- Pete Morse devoted his life to saving the lives of heroin users. A dreadlocked community activist with a Ph.D in history, he bore a tattoo that read: "Injury to one is an injury to all."

So his friends and colleagues were shocked when he was found unconscious in 2007 on...